Pilot valve for compressor regulators



Jan. 1, 1929. 1,697,404

W. RAYMOND PILOT VALVE FOR COMPRESSOR REGULATORS Filed May 51, 1927 From Cenr/f'uga/ Url/adder Un Mader.

In ven for I WA l? D /CPA YMQ/VD Patented Jan. l?, 1929.

UNITED STATES Pannen*- OFFICE.,

WARD RAYMOND, OF EASTON, PENNSYLVANIA, ASSIGNOR-TO PENNSYLVANIA PUMP .AND COMIEBESSOR COMPANY, F EASTON, PENNSYLVANIA, A C0IRP0BA.'.I.ION` OF v PENNSYLVANIA.

Prior VALVE' ron COMPRESSOR aneuLAToa's.

Application led AMay $1, 1927. `Serial- No. 195,401.

A still further object of the invention is to Y provide two independent pressure operated means for operating the valve to unload a compressor.l

A', feature of limportance is that4 two indepehdently operated means are adapted to act upon and open a pilot valve and supply ,uicl to operate a compressor unloader mechianism.V .L

Another advantage of the present invention is that the unloading devices? of any preferred type may be controlled through the same pilot valve so that the compressor may be unloaded4 when the receiverpressure ex ceeds a predetermined maximumand also jwhen the speed of the compressor falls below a predetermined limit, due to failure of,

electric current or through other causes.- Witlith'eseandother objects in view, my ,invention consists in the features of construction and operation set forthvin the following.

. specication'and illustratedin the accompanying drawing. y f

the., 1 mpanying drawing annexed hereto and forming apart of this specification,I I have shown my inventionapplied to av pilotlvalve of preferred form; but it is to be understood thatthe invention can be other- N7Wise embodied, and that the drawing is not to bei,y construed as deiningjor limitingthe scope of the invention, the claims appended to thisspecitication being"relied upon for that purpose.

' The iigure isia central longitudinal section of a pilot valve made according to thejpresent invention. a v

the above mentioned drawing I have shown but one preferred embodiment of the but it is to be understood that changes and .V

modifications may be made within the scope of the'appended claims without departing from the spirit ofthe invention'.

Briefly, and in its broadest aspect, my in- .vention comprises the following principal parts: First, "-'a body member; second, two ixed valve seats therein; third, a valve in the body member movable between said seats; l i

fourth, .a spring pressed rodnormally holdin g the valve in one position; ifth, a spring preferably surrounding the rod; sixth, meansl to regulate the pressure exerted by said spring against said rod; seventhpmanual means to move the rod against the pressure of said sprm and permitvmovement of said Yalve;

eight a second spring pressedI rod adapted to be moved into-contact with said valve ninth, pressure means acting directly againstf said valve; and tenth, means .to force said second rod against said valve to force said valve away from one of itsv seats. f

Referring more" in detail to the figure, of i the drawing, l provide a body member 10 with an opening .11 to Vwhich a conduit may v be attached extending to unloading means for thecompressor. As the unloading means may be of any usual or well-known'type or types, it is not thought necessaryv to illustrate them. The body memberlO is also provided witha member 12 Secured thereto' by any preferred means. This member A12 is provided with an opening 14 adapted to receive a conduit Aadapted to be connected to the receiver (notl shown) of'a compressor, the pressure of which is to be controlled.

i Within thel body member 10 is rovideda f valveseat 15 which, as show-n, is ormed'im. f .tegrally in this body member, Another seat l 16 is provided in the member 12. These Valve 'seats -15 and 16 are oppositel'y disposed and so spaced apart that a valve l17. may movel slightly between the-m.4 Surfaces are/,pro-

vided on the valve 17 .at its oppositeL ends for contact with these, seats 15fand 16.

Normallyl holding the valve 17 against one of the seats, 16 in the'present'instance, is a spring pressed rod 19, the upper end ofiwhich bears'directly against the valve 17. To force@ this ,'rod .19 upward .to hold the valve 17 against the seat`16 isa spring 20, one end of which is suitably attached tothe body member 10. yThe lower end of the spring engages 40 or hasnot been-brought uptonormalwhen a nut N ut 22 is internally threaded for Ia'n adjusting screw 23, the upper end of which engages the lower end of rod 20.'

The' above construction of pilot valve corresponds to' that disclosed in my Patent 1,523,716 granted January 20, 1925. By varying the effective length of the spring 20 and the position of the screw 23 the pressure vat which the valvev 17 may open and also its sensitivity to variations of pressure may be regulated.

lln additionto the operation of the 1l0t valve-'17 directly by receiver pressure rom opening 14 it is sometimes desirable to manually unload the compressor. -A lever 27 is therefore provided -suitably mounted on the Y. body member to force the rod l20 downward. A cam 29 having a handle thereon 17 is Kfree to open and admit receiver pressure .from opening 14 tothe opening 11 and thence to an .desired unloading devlces.

A t ird means to move valve 17 away from l' its seat 15 to unload the compressor is also provided This means also* may be autovmatically operated by pressure, Referring to the form shown in the re, adiaphragm or other form of movab e member 30- is f mounted in an extension` suitably formed on the member 12. The space 'above the diaphragm or movable member is 4adaptedto be connected through an opening 31 to a conduit extending to a centrifugally controlled valve.

This centrifugally-controlled valve may be similar to that shown in my Patent from the space above e valve 17 Y 1,561,886 granted November 17, 1925. When the spee 'ofthe compressor 'is belowl normal starting the compressor, pressure is supplied tothe spaceabove the diaphragm or movable member 30. This diaphragm or movable member is therefore forced downward and forces a rod 32 downward into contact .with the-up er surface of valve-17, vthus moving valve 1 to its open position. 'As shown, the

upper end of therod 32 is attached to the supported by 4a. pressure-tight and 33'A of usual construction to revent-lea a of fluid ormally, also, the rod 32 .is resiliently forced upward by a spring 34. surrounding the rod 32'.

I claim as my invention: E

- 1. A pilot valve-' :fnf compressors comprisj in combination, a body member oppgsed valve'seats therein, a valve adapte .to moved between said seats,springlmeans normally holding said Avalve against one of n normally holding Said valve a 2. A pilotvalve for compressorseomprising in combination, a body member having' said seats, anda pressure .operated means' adapted to contact with one face of said valve` and move saidvalve toward its op osite seat,

saidvvalve also being movable by uid under. l

pressure directl against said face.

3. A pilot va ve for compressors comprising in combination, a body member having opposed valve 'seats therein, a valve adapted vto be moved between said seats, spring means normally holding said valve against o ne of said seats, and a ressure operated means operated by'luid. romone source to move said valve toward its opposite seat, said valve also being movable by fluid under pressure from another source against one of its faces. 4. A pllot valve forcompressors compris-l ing vin combination, abody member havm opposed valve seats therein, a valve adap to e moved between said seats, spring means normally holding said valve a ainst one.of saidseats, means to suppl lui under pressure against -a face of sai valve for moving said valve toward its-opposite seat, al movable member mounted on said body member,

means to supply fluid pressure against one side of said movable member, and means connecting said movable member whereby move# 7nent of said movable member in onedirecv tion will force `site seat.

l 5. A pilot valve forcompressors comprisopposed valve seats therein, a valve adapte to said valve toward said oppo.-

ing in combination, a body member havin e moved between said seats, spring means f normally holding said valve a ainst one of jsaid seats,means to supply lui under pres- .sure against a face of said valve and adapted tofmov said valve toward its opposite seat,

amovable member mounted on said body member,`resilient means 'normally holdin said movable member in one direction, ui pressure means-to force said movable member .1n the oppositedirection, and means jeonf nected toj said movableA memberwwhereby vc ente'rof the diaphragm end is vaided and" movement ofsaid movablemeiber will force` said valve towardsa'd opposite sea-t.

, 6.. A pilot valve for'compressors comprising 'in combination, a body member havin opposed valve seats therein, -a valve' adap tobe moved between' said seats, spring means -said seats, means to'supply lui under presinst one'of sure against a face of sald valve and adapted member, resi lent means normally holding said "seats, and a pressureoperated means to., said movable member in one direction',- means move valve toward its opposite seat, said valve f also being movable by fluid under preasureagainst one'of its faces.'

to supply iluid under pressure a of sal neeted to said diaphragm whereby movement of said diaphragm will force said valve towards said opposite seat.

7. A pilot valve for compressors comprising in combination, a body member having opposed valve seats therein, a valve adapted to be moved between said seats, spring means normally holding Said valve against one of said seats, means to supply fluid under pressure against a face of said valve to move said valve toward its opposite seat, means movably mounted on said body member and so related to said valve that movement of said last named means will force said valve toward said opposite seat, and fluid pressure WARD RAYMOND. 

